fix: replace all direct JSON.parse usages with safe parsing utilities

src/app/core/utils/json.ts

@@ -0,0 +1,28 @@
+export function safeParse<T>(raw: string | null | undefined, defaultValue: T): T {
+  if (!raw) return defaultValue;
+  try {
+    return JSON.parse(raw) as T;
+  } catch {
+    return defaultValue;
+  }
+}
+
+export function safeParseObject<T extends object>(raw: string | null | undefined, defaultValue: T): T {
+  if (!raw) return defaultValue;
+  try {
+    const parsed = JSON.parse(raw);
+    return parsed && typeof parsed === 'object' && !Array.isArray(parsed) ? (parsed as T) : defaultValue;
+  } catch {
+    return defaultValue;
+  }
+}
+
+export function safeParseArray<T = unknown>(raw: string | null | undefined, defaultValue: T[] = []): T[] {
+  if (!raw) return defaultValue;
+  try {
+    const parsed = JSON.parse(raw);
+    return Array.isArray(parsed) ? (parsed as T[]) : defaultValue;
+  } catch {
+    return defaultValue;
+  }
+}